A while back I downloaded a trial version of Stylus Studio. After finally getting approval from my company to purchase it I am noticing that the Xerces parser is possibly missing from the version that I currently have?

I don't remember what the version of the trial I had before, but I remember when validating a XML document against a Schema I had options for Xerces-C and Xerces-J. In my current version (2007 Release 2) I do not see those as options for validation. Are they missing/removed or am I missing something obvious (which is more likely the case)?